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Yet another oldest Supernova ever
I'm getting a little confused by these announcements. Today they
announced that they have discovered the oldest and farthest supernova ever, at nearly 11 billion light-years. But just a few weeks back, didn't they announce the oldest, farthest Gamma-Ray Burst, which would also be a type of supernova. And the GRB was farther away still, at over 13 billion light-years. Most Distant Supernovae Found ""The ones that we've detected happened about 11 billion years ago, so you're getting close already," said lead author Jeff Cooke, an astronomer at the University of California, Irvine. " http://news.nationalgeographic.com/n...supernova.html The previous announcement, about the oldest GRB they found was in this thread: sci.astro | Google Groups http://groups.google.com/group/sci.a...dd3c5a0e5f737d Yousuf Khan |
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Yet another oldest Supernova ever
Sam Wormley wrote:
So did you sort out to your satisfaction the details and differences between these observations? No, enlighten me. Yousuf Khan |
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Yet another oldest Supernova ever
On Jul 9, 9:00*pm, Yousuf Khan wrote:
I'm getting a little confused by these announcements. Today they announced that they have discovered the oldest and farthest supernova ever, at nearly 11 billion light-years. But just a few weeks back, didn't they announce the oldest, farthest Gamma-Ray Burst, which would also be a type of supernova. And the GRB was farther away still, at over 13 billion light-years. Most Distant Supernovae Found ""The ones that we've detected happened about 11 billion years ago, so you're getting close already," said lead author Jeff Cooke, an astronomer at the University of California, Irvine. "http://news.nationalgeographic.com/news/2009/07/090708-most-distant-s... The previous announcement, about the oldest GRB they found was in this thread: sci.astro | Google Groupshttp://groups.google.com/group/sci.astro/tree/browse_frm/thread/3dabd... * * *Yousuf Khan It's a bit like religion. Hardy |
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Yet another oldest Supernova ever
Sam Wormley wrote:
Yousuf Khan wrote: Sam Wormley wrote: So did you sort out to your satisfaction the details and differences between these observations? No, enlighten me. Yousuf Khan http://www.skyandtelescope.com/commu.../50249452.html This is just another article about the same story I previously posted in this thread. What I was asking about was if people had previously discovered GRB's at 13 billion light-years already, then why are these people saying that these supernova at around 11 billion light-years are the farthest out yet? 13 billion beats 11 billion doesn't it? Yousuf Khan |
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Yet another oldest Supernova ever
Dear Yousuf Khan:
On Jul 9, 9:44*pm, Yousuf Khan wrote: Sam Wormley wrote: * So did you sort out to your satisfaction the details and differences between these observations? No, enlighten me. Not all GRBs are supernovae. More correctly, a supernova has to have other characteristics, including a certain duration / luminosity relationship. David A. Smith |
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Yet another oldest Supernova ever
On Jul 10, 3:15*pm, dlzc wrote:
Not all GRBs are supernovae. *More correctly, a supernova has to have other characteristics, including a certain duration / luminosity relationship. I think in this case, they did identify this GRB as a supernova. I guess the other possibilities for GRBs are Active Galactic Nucleii. AGN's are usually long-duration, while supernovas are short duration GRBs. |
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Yet another oldest Supernova ever
In article ,
Yousuf Khan writes: didn't they announce the oldest, farthest Gamma-Ray Burst, which would also be a type of supernova. And the GRB was farther away still, at over 13 billion light-years. I think the difference -- as you indicate in a later message -- is that GRBs are not known to be supernovae. A difference that is of considerable practical interest is that intrinsic luminosities of GRBs are not known even crudely. That makes cosmological tests using GRBs impossible. Mind you, I'm not sure luminosities for Type IIn SNe are known well enough to do cosmology, but at least there's some hope for those. -- Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA (Please email your reply if you want to be sure I see it; include a valid Reply-To address to receive an acknowledgement. Commercial email may be sent to your ISP.) |
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Yet another oldest Supernova ever
On Jul 10, 3:37*pm, (Steve Willner) wrote:
In article , *Yousuf Khan writes: didn't they announce the oldest, farthest Gamma-Ray Burst, which would also be a type of supernova. And the GRB was farther away still, at over 13 billion light-years. I think the difference -- as you indicate in a later message -- is that GRBs are not known to be supernovae. A difference that is of considerable practical interest is that intrinsic luminosities of GRBs are not known even crudely. *That makes cosmological tests using GRBs impossible. *Mind you, I'm not sure luminosities for Type IIn SNe are known well enough to do cosmology, but at least there's some hope for those. -- Steve Willner * * * * * *Phone 617-495-7123 * * Cambridge, MA 02138 USA * * * * * * * * (Please email your reply if you want to be sure I see it; include a valid Reply-To address to receive an acknowledgement. *Commercial email may be sent to your ISP.) Each new and improved telescope (terrestrial or orbital) will discover older and further away objects or cosmic events. So what? What about all the stuff that's nearby and could directly affect us? (obviously it's not getting 0.1% of the public funded action) ~ BG |
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Yet another oldest Supernova ever
On Jul 10, 10:18*am, Yousuf Khan wrote:
Sam Wormley wrote: Yousuf Khan wrote: Sam Wormley wrote: * So did you sort out to your satisfaction the details and differences * between these observations? No, enlighten me. * * Yousuf Khan *http://www.skyandtelescope.com/commu.../50249452.html This is just another article about the same story I previously posted in this thread. What I was asking about was if people had previously discovered GRB's at 13 billion light-years already, then why are these people saying that these supernova at around 11 billion light-years are the farthest out yet? 13 billion beats 11 billion doesn't it? * * * * Yousuf Khan What do you expect from a parrot like Sam Wormley? ~ BG |
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Yet another oldest Supernova ever
On Jul 10, 1:07*pm, Sam Wormley wrote:
Yousuf Khan wrote: Sam Wormley wrote: Yousuf Khan wrote: Sam Wormley wrote: * So did you sort out to your satisfaction the details and differences * between these observations? No, enlighten me. * * Yousuf Khan *http://www.skyandtelescope.com/commu.../50249452.html This is just another article about the same story I previously posted in this thread. What I was asking about was if people had previously discovered GRB's at 13 billion light-years already, then why are these people saying that these supernova at around 11 billion light-years are the farthest out yet? 13 billion beats 11 billion doesn't it? * * Yousuf Khan * *Have you considered that the GRB might result from something * *other than a supernova explosion. Did you compare the energy * *levels? And those level differences are? ~ BG |
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